Draft device for locomotives



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T. WISE. DRAFT DEVICE FOR LOGOMOTIVBS.

'No.-498,09"7'. v Patented May 23, 1893.

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T. WISH, DRAFT DEVICE FOR LOCOMOTIVES. No. 498,097. Patented May 23, 1893.

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UNTTEE STATES PATENT OF ICE.

THOMAS WISE, OF SOUTH FRAMINGHAM, MASSACHUSETTS.

DRAFT DEVICE Fo R LOCOMOTIVES.

SPECIFICATION forming part of Letters Patent No. 498,097, dated May 23, 1893.

Application filed January 18, 1892. Serial No. 418,50i 5. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS WISE, of South Framingham, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Draft Devices for Locomotives, of which the following is a specification.

My invention has relation to locomotives, and steam fire-engines; and it has for its object the provision of a method of and means for supplying a draft of air and steam, or it may be air alone, to. a .fire-box or furnace to promote combustion.

Heretofore, in order to assist the combustionof fuel in the fire-box or furnace of locomotives and steam fire-engines for the purpose of quickly raising steam, a draft has been created by the steam exhaust in the smoke arch, or by the use of the blower discharg' ing steam through the smoke stack, both of the said modes resulting in the creation of a vacuum which was filled by air which rushed in through the fuel on the grate. Other means or methods have also been employed for creand combustion of fuel in the furnace of 10-.

comotives and steam fire engines which consists in discharging the steam from the cylinders through other medium than the smoke stack so as not to affect the draft in the furnace and introducing a current of air and steam to the furnace from the bottom of the same.

My invention also consists in providing a blower or blast fan which may be attached to a locomotive or steam fire engine at any suitable point, and a pipe or tube leading from the said blower to a tight ash pan below the grate, so that air and steam, or air alone, may

be forced through the burning fuel, and the necessary draft, and requisite quantity of oxygen, supplied to the furnace, all as I will now proceed to describe and claim.

Reference is to be had to the annexed drawings, and to the letters of reference marked thereon forming a part of this specification.

Figure 1, of the said drawings is a side elevation partially in section of a locomotive 6o equipped with my improvements for supplying draft to the furnace. Fig. 2, is a sectional end view of a portion of a locomotive showing the manner of discharging the steam from the cylinders in the employment of my improved process.

Although I have herein shown my improvements as connected with a locomotive engine,

they are not confined to use in connection therewith, since, as has been hereinbefore stated, the invention may be employed in connection with steam fire-engines as well.

In the drawings: a designates the boiler of a locomotive.

b is a furnace or fire-box. c are the fines leading from the furnace b. d designates the grate, and e the ash pan below the grate. 7 f designates an incased fan blower or blast fan, which may be supported by or upon any convenient part of the locomotive. As herein shown, the blower is supported upon a plate 9 which rests upon the horizontal portions of stirrups hconnected at their upper ends to the frame 1' between the truck'j and links is. Z designates a pipe which extends from the blowerf to the ash pan e, which is made tight so as that air or steam or other gas blown therein may find an exit only through the fuel on the grate in the furnace. o

Connection may be made by means of a pipe or other device between the blower and with the exhaust pipe of the motor employed to drive the blower, or with boiler or exhaust pipes of the locomotive so that steam may be 5 mixed with the air forced into the furnace in order to supply an extra amount of oxygen to the fire to promote the combustion of the gases and the consumption of the smoke.

Air may be supplied to the blower in the too usual way, or it may first be heated and mixed with superheated or other steam or gas and be received into the blower from any suitable reservoir or course.

The fan blower may be operated by a motor such as is shown and described in the patent granted to me August 19, 1884:, No. 303,781, or by any other suitable means. I

m m (Fig. 2) designate the cylinders, and 'n n the exhaust pipes. The latter, as herein shown, extend from the cylinders through the smoke box into the steam stacks 0 which extend up on opposite sides of the smoke stack 13, though the said exhaust pipes might extend up outside of the smoke arch to any other convenient point. The steam stacks 0 may be of larger diameter than the exhaust pipes n, so as to obviate back pressure upon the pistons, which is now experienced by exhausting the steam through comparatively small nozzles into the smoke stack.

By the means last described I am enabled to exhaust the steam without in any way atfecting the draft of the furnace; and utilize the force heretofore exerted by way of backpressure upon the pistons in driving the engine.

The objections to creating a draft by means of exhausting the steam in the smoke stack are the irregularity of the draft, the liability of seriously tearing the fire, and the con:

stant drawing off and discharge of sparks and other particles of unconsumed fuel.

Having thus described my invention and explained a way of constructing and using the same, I declare that what I claim is-- A locomotive engine having its steam exhaust separate from and independent of the smoke stack and having no means of communication thereto, and a fan blower arranged to create a draft through the furnace, whereby steam exhaust in the smoke flue is avoided, substantially as described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 30th day of December, A. D. 1891.

THOMAS WISE.

W'itnesses:

HORACE BROWN, ARTHUR W. CROSSLEY. 

